Suddenly, a large army of enemies attacks from the future world through a space-time gate. Houtarou/Kamen Rider Gotchard and his friends somehow manage to fight back. In the future, they find Houtarou from 20 years later, Kamen Rider Gotchard Daybreak, who once saved them from a difficult situation. "This time I have to save them!" Houtarou and his friends sense the danger in the future and use the "Gigantliner" to travel through space-time and set out on a great adventure to the future where Daybreak is!.